/*
GanttProject is an opensource project management tool.
Copyright (C) 2004-2011 GanttProject Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
package net.sourceforge.ganttproject.time.gregorian;

import java.util.Calendar;
import java.util.Date;

import net.sourceforge.ganttproject.calendar.CalendarFactory;
import net.sourceforge.ganttproject.time.DateFrameable;

public class WeekFramerImpl implements DateFrameable {
    private final FramerImpl myDayFramer = new FramerImpl(Calendar.DATE);
    private final ICalendarFactory myCalendarFactory;

    public static interface ICalendarFactory {
        Calendar newCalendar();
    }

    private static class DefaultCalendarFactory implements ICalendarFactory {
        @Override
        public Calendar newCalendar() {
            return CalendarFactory.newCalendar();
        }
    }

    public WeekFramerImpl() {
        this(new DefaultCalendarFactory());
    }

    public WeekFramerImpl(ICalendarFactory calendarFactory) {
        myCalendarFactory = calendarFactory;
    }

    @Override
    public Date adjustRight(Date baseDate) {
        Calendar c = myCalendarFactory.newCalendar();
        do {
            baseDate = myDayFramer.adjustRight(baseDate);
            c.setTime(baseDate);
        } while (c.get(Calendar.DAY_OF_WEEK) != c.getFirstDayOfWeek());
        return c.getTime();
    }

    @Override
    public Date adjustLeft(Date baseDate) {
        Calendar c = myCalendarFactory.newCalendar();
        c.setTime(myDayFramer.adjustLeft(baseDate));
        while (c.get(Calendar.DAY_OF_WEEK) != c.getFirstDayOfWeek()) {
            c.setTime(myDayFramer.adjustLeft(myDayFramer.jumpLeft(c.getTime())));
        }
        return c.getTime();
    }

    @Override
    public Date jumpLeft(Date baseDate) {
        Calendar c = myCalendarFactory.newCalendar();
        c.setTime(myDayFramer.adjustLeft(baseDate));
        int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
        do {
            baseDate = myDayFramer.jumpLeft(baseDate);
            c.setTime(baseDate);
        } while (c.get(Calendar.DAY_OF_WEEK) != dayOfWeek);
        return c.getTime();
    }
}